Goal:
  
  G : t
  invG : invariants G
  acG : acyclic_no_sloop G
  x : V.t
  p : PathOf G x x
  wp : weight p > 0
  rx := spath_refl G VSet.empty x : SPath G VSet.empty x x
  ============================
   False


DEBUG:Going to execute:
<coq-core.plugins.ssreflect::ssrhave@0> $1
DEBUG LTAC Evaluated term: (spath_refl G VSet.empty x)